Ever wanted to be immortal? Be careful what you wish for. Living forever wouldn't just mean outliving your friends, family and descendants, there's also the inconvenient reality of ageing. Beyond the superficial stuff, such as wrinkles and saggy bits, you'd have a host of age-related diseases to contend with. The older we get, the greater our chances of developing cancer, heart disease, Alzheimer's and almost every other common condition. Meanwhile our immune system wears out and puts up an increasingly weak defence against infections. Who wants to endure millennia of that? No thanks! But imagine you could live a long life and remain healthy right to the end. That surely would be worth wishing for. Scientists have been seeking ways to achieve this. Now they might just have found one.
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